** Indian auto stocks .NIFTYAUTO rise 5.3% this week
** Fifteen-member Nifty Auto index set for best week since May 2025, led by Mahindra & Mahindra MAHM.NS
** Effective tax rate on SUVs drops to 50% from 45%-50% earlier due to removal of extra cess; Investec estimates the change would benefit 50% of MAHM's volumes
** On Friday, MAHM shares climb 2.25% to record 3,558 rupees
** Industry-wide car volume growth to return to 10% in the next 1-2 years as entry-level models become more affordable, BofA said in a note on Thursday
** Meanwhile, Eicher Motors EICH.NS second-best performer on index, up 7.4% this week as GST drop benefits 86% of its volumes
** YTD, Nifty Auto index's ~15% rise tops Nifty 50's .NSEI 4.3% climb
(Reporting by Urvi Dugar)
((UrviManoj.Dugar@thomsonreuters.com))